Binding strip affixing device



July 11, 1939. w ENGEL 2,165,540

BINDING STRIP AFFIXING DEVICE Filed- May 9, 1938 in Figure Patented July 11, 1939 UNITED STATES PATENT 2,165,540 I BINDING STRIP AFFIXING DEVICE Albert w. Engel, amigo, in. Application May 9, 1938, Serial No. 206,930

This invention relates to transparencies, such as slides, for use in stereopticons and similar projectors, and its object is to provide a device and supplies for facilitating the assembly of the parts constituting such a slide. The inventwnconsists in certain features of construction and certain modes of use, as hereinafter described and illustrated in the drawing, and as indicated by the claims.

In the drawing:

Figure 1 is a plan view of a bindingstrip adapted for application to one edge ofa slide;

Figure 21s a perspective view showing the block, which is a feature of this inventiomwith abinding strip placed thereori ready for use.

Figure 3 is a transverse section of the block and binding strip, as indicated at line 3+-3 on Figure 2.-

Figure 4 is a perspective view showing'the assembly of cover glasses andpicturefilm with masking means placed in position on a'binding stripon the block.

Figure 5 shows a slide pressed part-way into the slot of the block so that-the binding strip is folded part-way toward itsfinalposition. I V

Figure 6 shows the slide inserted fully into the slot of the block for completing the folding and gumming of the binder strip thereon.

Figure '7 shows an optional step following, that of Figure 6 for causing the applicator strip to adhere more firmly to the outer faces of the slide.

Figure 8 is a top plan view of a. modified form of block adapted for use with binding strips of difierent lengths. U V

Figure 9 is an end elevation of the block shown Transparent slides for projection are usually made up with two cover glasses" between" which there is secured a transparent picture element in the nature of a glass plate or film together with a proper masking sheet for defining the outlines of the picture to be projected. These parts are secured permanently together at'their edges-by means of an overlapping binding element which may be of cloth or gummed paper. My in'vention has to do with the applicatio'm of-siieli binding means in aconvenientandrapidmanherf adapted (01. sic-61) may be mitered, as shown at l so that when such strips are applied to all four edges of the sild'e they will meet in abutting relation at the corners, instead of overlapping.

The device which serves for aihxing the binding strips to the slide is shown as a block 2 which is of elastic or resilient material, preferably such as rubber, and is formed with a medial groove 3 Whose side walls 3 are slightly divergent upwardly. In the upper face of the block 2 I provide a recess 4 dimensioned to receive one of the binding strips I; and, preferably, the lateral edges of the recess are formed as slightly overlapping lips 5 under which the edges of the strip I may be engaged and retained until withdrawn in the of the slot 3 for a' purpose which will be further explained.

When the gummed binding strip f has been positionedin the recess 4' of the block2 as shown in Figure 2, it is ready for theslide assembly which may consist, as shown; of two cover glasses 1-,1 and an intermediate masking element 3 with which is associated the transparent picture filni exposed in' the opening 8 of the maslrt. The gummed surface'having been moistened, the assembly is then applied edgewise to the binding strip and directly over the slot 3 of the block 2 as seen in Figure 4; Slight downward pressure uponthe slide assemm for es the middle: portion Of the strip I into theslot' 3 and ten s to fold its lateral portions I upwardly, as showriin Figure 5. Further pressure carries the slide assembly and thebinding' strip to the bottom of the slot 3 as seen in'Figure 6; and by virtue of there silierit nature of the block 2 and the positioning of its supporting portion 6, 6' in widely spaced 4 relation, as compared with the'width of the slot 3' such further pressure ten s to deflect the middle po'r't'iori' 2 of the block 2 downwardly, and to swing the side walls 3? of" the slot 3'toward each other; tending 'toclose the slot. This adds lateral The drawing shows one binding strip fully applied to one edge of the slide assembly, and shows a second strip in the process of application thereto. will be applied to the remaining edges of the as sembly to complete the slide.

It may be understood that it is not essential that the corners of the binding strips be mitered, and that, if preferred, a straight-cut strip may be used, overlapping at the corners of the slide. Figures 8 and 9 illustrate an applicator block 20 adapted for use with such strips, which may be of various lengths, corresponding to different sizes of slides. In this block 20 the recess to receive the straight-cut binding strip l0 extends from end to end of the block, its lateral edges forming overhanging lips l5 for the same purpose as the lips 5 of the block 2. Theoperation of this form of block is exactly the same as that already described for the block 2.

Thus it will be seen that by the use of my affixing device the binding material may be conveniently and rapidly applied to a slide assembly, and that by the use of this device it is comparatively easy for the novice to produce a neat and efficient binding job with the marginal portions of the binding strips evenly and uniformly distributed between the two sides of the slide, assuring permanence and good appearance. It may be understood that any suitable sheet material may be employed for the manufacture of the binding strips l or ID; gummed paper or clothis entirely suitable, but in some instances tape of cellulose or acetate composition, such as Cellophane, may be found satisfactory, and, although a dry gum coating, which requires moistening before use, presents no particular difficulty, it may be found more convenient to employ a tape havinga tacky adhesive coating, which is ready for use without addition of moisture.

While there is shown and described herein certain specific structure embodying the invention, it will be manifest to those skilled in the art that various modifications and re-arrangements of the parts may be made without departing from the spirit and scope of the invention, and that the same is not limited to the particular .form herein shown and described, except in so far as indicated by the appended claims.

I claim:

1. A binding strip afi'ixing device comprising a. block of resilient material having a groove, the width of said groove being approximately equal to the thickness of the material to be bound, the side walls of the groove being upwardly divergent to facilitate insertion of the material with a binding strip, and the resilience of the block allowing it to be bent for pressing said divergent walls toward each other to secure the binding strip to the material in the groove.

2. A binding strip affixing device comprising a block of resilient material having a groove, the width of said groove being approximately equal to the thickness of the material to be bound, said groove dividing the block into two sections and said block having supporting portions for its two sections respectively spaced apart by a distance. greater than the width of said groove, whereby the part of the block directly under the groove is normally spaced above a supporting surface and may be flexed toward such surface by pressure upon the material inserted in the groove, such pressure tending to rock the two sections of the block toward each other, pressing the sidewalls of the groove against the material to be bound.

It will be obvious that two additional strips arcane k 3'. A binding strip afiixing device comprising a block of resilient material having a groove, the

width of said groove being approximately equal to the thickness of the material to be bound, the side walls of the groove being upwardly divergent to facilitate insertion of the material with the binding strip, said groove dividing the block into two sections and said block having supporting portions for its two sections respectively spaced apart by adistance greater than the width of said groove,. whereby the part of the block directly under the groove is normally spaced above the supporting surface and may be flexed toward such surface by pressure upon the material inserted-in the groove, such pressure tending to rock. the two sections of the block toward each other, pressing the side walls of the groove against the material to be bound.

4. A binding strip afiixing device comprising a block of resilient material having a groove, the width of said groove beingapproximately equal to the thickness of the material to be bound, said groove dividing the block into two sections, said block having supporting ribs projecting downwardly from the outer marginal portions of said sections respectively and thus spaced apart by a distance. substantially greater than the width of the groove, whereby the part of the block directly under the groove is normally spaced above a supporting surface and may be flexed toward such surface by pressure upon the material inserted in the groove, such pressure tending to rock the two sections of the block about their supporting ribs for pressing the side walls of the groove against the material to be bound,

5. A binding strip afiixing device comprising a block of resilient material having a groove, the width of said groove being approximately equal to the thickness of the material to be bound, the upper surface of theblock having a shallow recess extending at both sides of the groove and dimensioned to receive and position an adhesive binding strip in flat form, whereby the edge of the material to be bound may be applied to the binding strip over the groove, and said material may sioned to receive and position an adhesive binding f strip in flat form, the lateral walls of the recess being slightly under-cut to form overhanging lips to retain the strip temporarily in the recess, whereby the edge of the material to be bound may be applied to the binding strip over the groove, and said material may then be forced into the groove for folding up the margins of the binding strip against theopposite faces of said material.

7. A bindingstrip afiizdng device including two sections spaced apart to form a groove, the width of said groove being approximately equal to the thickness of the material to be bound to permit. insertion ofthe material with a binding strip, and said sections being connected by resilient means adapted to be bent for pressing the walls of the groove toward each other to secure the bindingstrip adhesively to the material.

8., Abinding strip affixing device including two sections spaced apart to form a groove, the width of said groove being approximately equal to the thickness of the material to be bound to permit insertion of said material with a binding strip, means forming the bottom of the groove to which means said two sections are flexibly joined, together with supporting means for the two sections respectively spaced apart by a distance greater than the width of said groove, whereby the means forming the bottom or" the groove is normally spaced above the supporting surface and the device may be flexed by pressure upon the material inserted in such groove, such pressure tending to rock the two sections toward each other, pressing the side walls of the groove against the material to be bound.

9. A binding strip afiixing device including two sections having opposed resilient faces spaced apart by a distance approximately equal to the thickness of the material to be bound to permit insertion of said material and its binding strip between said sections, and flexible means connecting the sections, whereby the side walls of said sections may be pressed toward each other for pressing the binding strip adhesively against the material inserted in .thespace between said opposed faces.

ALBERT W. ENGEL. 

